title: Destination of organic pollutants during electrochemical oxidation of biologically-pretreated dye wastewater using boron-doped diamond anode.
abstract: Electrochemical oxidation of biologically-pretreated dye wastewater was performed in a boron-doped diamond (BDD) anode system. After electrolysis of 12h, the COD was decreased from 532 to 99 mg L(-1) (<100 mg L(-1), the National Discharge Standard of China). More importantly, the destination of organic pollutants during electrochemical oxidation process was carefully investigated by molecular weight distribution measurement, resin fractionation, ultraviolet-visible spectroscopy, HPLC and GC-MS analysis, and toxicity test. As results, most organic pollutants were completely removed by electrochemical oxidation and the rest was primarily degraded to simpler compounds (e.g., carboxylic acids and short-chain alkanes) with less toxicity, which demonstrated that electrochemical oxidation of biologically-pretreated dye wastewater with BDD anode was very effective and safe. Especially, the performance of BDD anode system in degradation of large molecular organics such as humic substances makes it very promising in practical applications as an advanced treatment of biologically-pretreated wastewaters.
authors.affiliation: Department of Environmental Engineering, Peking University, the Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing100871, China.
authors.forename: Xiuping
authors.initials: X
authors.lastname: Zhu
authors.forename: Jinren
authors.initials: J
authors.lastname: Ni
authors.forename: Junjun
authors.initials: J
authors.lastname: Wei
authors.forename: Xuan
authors.initials: X
authors.lastname: Xing
authors.forename: Hongna
authors.initials: H
authors.lastname: Li
mesh_terms: D001895:Boron; D004396:Coloring Agents / Q000737:chemistry*; D018130:Diamond; D004566:Electrodes; D004572:Electrolysis / Q000295:instrumentation / Q000379:methods*; D006812:Humic Substances; D009930:Organic Chemicals / Q000737:chemistry; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D006812:Humic Substances; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D018130:Diamond; D001895:Boron